Just allowing concealed carry at all doesn't strike me as that big of a deal, particularly since ultralib bureaucrats are going to make the process as difficult as possible. For that same reason you won't get much of the harm or good that comes from having more guns around.
On a day to day basis though, it really only makes sense to have a lot of guns around if you have a pre-existing responsible gun culture. California is so politically hyperactive that I don't think there's much room for that kind of thing to germinate.
